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Chemical preparation, thermal behavior, kinetic and IR studies are given for the cyclotriphosphate Ca3(P3O9)2•10H2O. Ca3(P3O9)2•10H2O is monoclinic P21/n with the following unit-cell dimensions: a = 9.332(7)A, b = 18.13(1)A, c = 7.841(5), β = 106.69(5)° and Z = 2. Ca3(P3O9)2•10H2O has never been studied except for its crystallographic characterization. The thermal behavior of Ca3(P3O9)2.10H2O has been studied and interpreted by comparison with IR absorption spectrometry, X-ray diffraction experiments, chemical analyses, thermal analyses (TGA-DTA) and differential scanning calorimetry (DSC). Ca3(P3O9)2•10H2O is stable, in the conditions of temperature and pressure of our laboratory, until 80°C. It is impossible to dehydrate Ca3(P3O9)2•10H2O without breaking its rings P3O93- and leading to amorphous compounds in X-ray diffraction and IR absorption spectrometry. The final product of the dehydration and calcination of Ca3(P3O9)2•10H2O, under atmospheric pressure is its long chain polyphosphate form β, β[Ca(PO3)2]8. β[Ca(PO3)2]8 is stable until its melting point at 1097°C. On the other hand, β[Ca(PO3)2]8is prepared by dry way. β[Ca(PO3)2]8 has many applications in industry such as humidity sensor and corrosion inhibitor. Also, quantum chemical calculations have been performed for the P3O9 rings.

CHEMICAL PREPARATION, THERMAL BEHAVIOR, KINETIC AND INFRARED STUDIES AND QUANTUM CHEMICAL CALCULATIONS OF Ba3(P3O9)26H2O